Skip to main content
eScholarship
Open Access Publications from the University of California

Molybdenum Disulfide Catalytic Coatings via Atomic Layer Deposition for Solar Hydrogen Production from Copper Gallium Diselenide Photocathodes

  • Author(s): Hellstern, Thomas R
  • Palm, David W
  • Carter, James
  • DeAngelis, Alex D
  • Horsley, Kimberly
  • Weinhardt, Lothar
  • Yang, Wanli
  • Blum, Monika
  • Gaillard, Nicolas
  • Heske, Clemens
  • Jaramillo, Thomas F
  • et al.
Abstract

© Copyright 2019 American Chemical Society. We demonstrate that applying atomic layer deposition-derived molybdenum disulfide (MoS2) catalytic coatings on copper gallium diselenide (CGSe) thin film absorbers can lead to efficient wide band gap photocathodes for photoelectrochemical hydrogen production. We have prepared a device that is free of precious metals, employing a CGSe absorber and a cadmium sulfide (CdS) buffer layer, a titanium dioxide (TiO2) interfacial layer, and a MoS2 catalytic layer. The resulting MoS2/TiO2/CdS/CGSe photocathode exhibits a photocurrent onset of +0.53 V vs RHE and a saturation photocurrent density of -10 mA cm-2, with stable operation for >5 h in acidic electrolyte. Spectroscopic investigations of this device architecture indicate that overlayer degradation occurs inhomogeneously, ultimately exposing the underlying CGSe absorber.

Main Content
Current View